package generics.and.colecctions.ClasesQueImplementanInterfaces;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class ConcurrentHashMapTest {

	public static void main(String[] args) {

		Map<String, String> mapa = new ConcurrentHashMap<String, String>();
		// mapa.put(null, "");//NPE
		mapa.put("", null);// NPE
	}
}
